Long Description:It is generally considered as the first true Art Nouveau building, because of its highly innovative plan and its ground breaking use of materials and decoration. Together with three other town houses of Victor Horta, including Horta's own house and atelier it was put on the 'UNESCO World Heritage List' in 2000. It is located at 6, Rue Paul-Emile Jansonstraat in Brussels.

At the Hôtel Tassel Horta built a house consisting of three different parts. Two rather conventional buildings in brick and natural stone — one on the side of the street and one on the side of the garden — were linked by a steel structure covered with glass. It functions as the connective part in the spatial composition of the house and contains staircases and landings that connect the different rooms and floors. Through the glass roof it functions as a light shaft that brings natural light into the centre of the building. In this part of the house, that could also be used for receiving guests, Horta made the maximum of his skills as an interior designer. He designed every single detail; doorhandles, woodwork, panels and windows in stained glass, mosaic flooring and the furnishing. Horta succeeded in integrating the lavish decoration without masking the general architectural structures.

The innovations made in the Hôtel Tassel would mark the style and approach for most of Horta's later town houses, including the Hôtel van Eetvelde, the Hôtel Solvay and the architects own house and 'atelier'. It might be superfluous to mention that these houses were very expensive and only affordable for the rich 'bourgeoisie' with an 'Avant-Garde' taste. For this reason the pure architectural innovations were not largely followed by other architects. Most other Art Nouveau dwellings in Belgium and other European countries were inspired by Horta's 'whiplash' decorative style which is mostly applied to a more traditional building.

The Hôtel Tassel had a decisive influence on the French Art Nouveau architect Hector Guimard who later developed a personal interpretation of Horta's example.

Hôtel Tassel is currently a private office and the interior is not accessible to the public.